| 1 | WCWB Energy, LLC | Midland, TX 79701 | Oil Operator | Sep 2015 |
| 2 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 3 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 4 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 5 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2024 |
| 6 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 7 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 8 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 9 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2024 |
| 10 | WPX Energy Gulf Coast, LP | Benbrook, TX 76126 | Oil & Gas Operator | May 2012 |
| 11 | Wyoming Diamond A LLC | Cheyenne, WY 82007 | Gas Operator | May 2024 |